Function intrpt_read

core/interrupt.c:35–75

const uint32_t revision = 0x00010900;
static uint8_t intrpt_read(uint16_t pio, bool peek) {
    uint16_t index = pio >> 2 & 0x3F;
    uint8_t request = pio >> 5 & 1;
    uint8_t bit_offset = (pio & 3) << 3;

    uint8_t value = 0;

    (void)peek;

    switch(index) {
        case 0:
        case 8:
            value = read8(intrpt[request].status, bit_offset);
            break;
        case 1:
        case 9:
            value = read8(intrpt[request].enabled, bit_offset);
            break;
        case 3:
        case 11:
            value = read8(intrpt[request].latched, bit_offset);
            break;
        case 4:
        case 12:
            value = read8(intrpt[request].inverted, bit_offset);
            break;
        case 5:
        case 13:
            value = read8(intrpt[request].status & intrpt[request].enabled, bit_offset);
            break;
        case 20:
            value = read8(revision, bit_offset);
            break;
        case 21:
            value = (bit_offset & 16) ? 0 : 22;
            break;
        default:
            break;
    }
    return value;
}

static void intrpt_write(uint16_t pio, uint8_t value, bool poke) {
    uint16_t index = pio >> 2 & 0x3F;